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Stock Option Plan - Narrative (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 31, 2018	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forgiveness of notes receivable					$ 0	$ 437,000
Early exercise of stock options, share subject to repurchase (in shares)			78,757		78,757		16,117
Liability for early exercise of unvested stock options			$ 359,000		$ 359,000		$ 65,000
Stock options granted (in shares)					73,783
Weighted-average exercise price of stock options granted (in dollars per share)			$ 9.88		$ 5.51
Unrecognized compensation cost			$ 1,900,000		$ 1,900,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of option as percent of fair market value when individual owns more than 10% of shares outstanding (percent)					110.00%
Incentive Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of option as percent of fair market value (percent)					100.00%
Nonqualified Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of option as percent of fair market value (percent)					85.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)					10 years
Expiration period when individual holds more than 10% of shares outstanding (in years)					5 years
Award vesting period (in years)					4 years
Stock options granted (in shares)			19,998
Unrecognized compensation cost, expected period for recognition (in years)					2 years 1 month 6 days
Stock-based compensation expense			$ 328,000	$ 343,000	$ 1,081,000	$ 1,038,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period (in shares)		564,098
Weighted-average grant date fair value (in dollars per share)		$ 5.94
Stock-based compensation expense					$ 0
Performance Shares | Vesting Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		4 years
Awards granted in period (in shares)		408,544
Performance Shares | Vesting Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
Awards granted in period (in shares)		155,554
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period (in shares)	37,036
Weighted-average grant date fair value (in dollars per share)	$ 7.74
Restricted Stock Units | Vesting Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	1 year
Awards vesting rights (percent)	50.00%
Restricted Stock Units | Vesting Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	2 years
Awards vesting rights (percent)	50.00%
2008 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)							5,350,080

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